JPH11319601A - Mechanically pulverizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fine pulverized material and to improve the efficiency of power consumption by equipping a supply means for supplying a material to be pulverized from the peripheral direction to the vicinity of the center axis and continuously forming an ruggedness part in parallel to a fine gap in the circumferential direction on the side surface of a rotor. SOLUTION: The ruggedness part is continuously formed in the circumferential direction on each of the lower part side face 22A and the upper part side face 22B of the rotor. The ruggedness parts are also formed on the lower part side face 26A of a cylindrical body facing the lower part side face 22A of the rotor and the lower part side face 26A of the cylindrical body facing the upper part side face 22B of the rotor. The fine gap is provided by about 0.3-2.0 mm between the side surface 26B of a product exhaust side in the upper part of the cylindrical body and the outside of the upper part side face 22B of the rotor. The material to be pulverized is supplied from a supply opening of the material to be pulverized to the vicinity of the center axis. Compressed air is used in the supply opening 28 of the material to be pulverized and the air flow rate is controlled to become about 49-980 kPa in air pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner pulverizing apparatus and a fine particle pulverizing means, which can pulverize an object to be pulverized in a micron order into fine particles in the order of several tens of microns. It relates to a suitable mechanical grinding device.

[0002]

2. Description of the Related Art Conventionally, a rotary mechanical pulverizing apparatus for finely pulverizing an object to be pulverized has been disclosed in JP-A-59-105853.
The fine pulverizer described in the gazette is known. As shown in FIG. 6, this fine pulverizer has a cylindrical rotor (2) having a large number of concave and convex portions (21) parallel to the generatrix on an outer peripheral surface thereof, which are continuous in the circumferential direction.
2) is supported by a rotating shaft (23), and the rotating shaft (22)
A cylindrical stator (26) having a large number of concave / convex portions (25) parallel to the generatrix in the circumferential direction is fitted on the inner peripheral surface of the cylindrical stator (26) with a minute gap (24) provided outside of the gap. (24) is a grinding chamber.

[0003] The pulverizing step by this pulverizer will be described. A rotor (22) is rotated at a high speed, and a suction blower (not shown) connected to a product discharge port (27) provided above a stator (26) is provided. During operation, the material to be crushed is supplied into the machine through a supply port (28) provided below the stator (26), accompanied by air. In the machine, the object to be ground is a rotor (2
The airflow generated by the stirring blade (29) rotating integrally with the casing (2) rises along the inner peripheral surface of the casing (30), and the opposed gap (2) between the rotor (22) and the stator (26).
4) Pulverization is performed while flowing into the (pulverizing chamber) and riding on the upward swirling airflow generated by the rotation of the rotor (22) and flowing through the opposed gap (24) in the upward flow.

That is, the object to be crushed is given kinetic energy by a high-speed rotating rotor (22),
6) The vortex generated in the uneven portion (25) may collide with the uneven portion (25), or the rotor (22) and the stator (2)
Fine particles are formed by grinding between the projections of 6) and flow out from the gap (24). The fine particles are supplied to the rotor (2
2) and the airflow generated by the stirring blade (31) rotating integrally, the swirl rises along the inner peripheral surface of the casing (30) and is discharged from the product discharge port (27) to the outside of the machine.

[0005] In the pulverizer shown in FIG.
A classification ring for closing the concave portion of the uneven portion (25) of the stator (26), which prevents coarse particles from flowing out from the gap (24) and allows only fine particles to flow. The stator (26) also serves as a part of the casing (30). As described above, the object to be crushed is moved into the crushing chamber including the gap (24) between the rotor (22) and the stator (26) by the high-speed rotation of the rotor (22) and the uneven surface of the stator (26). The particles collide with each other due to the vortex generated from the uneven surface, and are pulverized into fine particles on the order of several tens of microns to several microns by receiving a shearing force.

In such a fine pulverizer, the rotor (2)
2) and the uneven portion (2) of the stator (26).
FIG. 7, FIG. 8, FIG. 9 or FIG.
The following has been proposed. In these figures, the uneven portion (21a) has a rectangular cross-sectional shape, and the uneven portion (21b) has a triangular cross-sectional shape. Of these, the combination shown in FIG. 10 is more excellent. It is known that a high crushing performance can be obtained.

As a rotary mechanical pulverizer, there is another one which has improved pulverization performance as disclosed in JP-A-59-105853. Angled to the outside so as to prevent the generation of coarse powder (JP-A-8-7)
No. 1439), an uneven portion which causes coarse powder is not provided on an inner peripheral surface of a stator at an outlet portion in a pulverizing space between an outer peripheral surface of a rotor and an inner peripheral surface of a stator (Japanese Patent Laid-Open No. 7-92).
No. 733), a groove on the inner peripheral surface of the stator extends in the direction of the rotation axis of the rotor and has a protrusion inside the groove to prevent coarse powder from entering.
No. 9827), the concave portion on the outer peripheral surface of the rotor has a triangular shape, and one side of the triangular concave portion on the front side in the rotational direction stands upright from the center of the rotor, and the other side on the rear side in the rotational direction is 45 ° to 60 °.
The triangular concave portion has a structure in which the front side in the rotation direction is deeper by making an angle of degree and gradually becomes shallower toward the rear side to improve the pulverization efficiency (Japanese Patent Publication No. 3-15489). In order to improve the pulverizing efficiency by making the cross section of the groove of the surface into a semicircular concave part (JP-A-5-269393), the toner surface is partially removed by a pulverizer having acute angle pulverizing blades on the outer peripheral surface of the rotor and the inner peripheral surface of the stator. In addition to those known to be pulverized to be spherical (JP-A-7-244399), JP-A-7-155628 and JP-B-61-3
No. 6457, Japanese Patent Publication No. 58-14822, Japanese Patent Publication No. 58-14823, Japanese Patent Publication No. 61-36459, Japanese Patent Publication No. 4-121191, Japanese Patent Application Laid-Open No. 5-184.
No. 960, Japanese Patent Publication No. 4-12190, and the like are known. However, in recent years, digitalization of dry toner has been promoted for high image quality, and a toner having a smaller particle size has been demanded. However, the above-mentioned conventional pulverizer has been pulverized in terms of pulverization processing capacity and power consumption. There is a problem that not only the performance is insufficient, but also that the powder cannot be pulverized to a target particle diameter.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art. It is an object of the present invention to easily obtain a fine pulverized product having a particle size on the order of several microns and to reduce power consumption. An object of the present invention is to provide a high-performance mechanical pulverizer that can be made more efficient and is suitable for producing dry toner.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to provide (1) a rotor having a large number of concavo-convex portions which are supported by a rotating shaft and are formed on an outer peripheral surface thereof in parallel with a generating line in a circumferential direction; A cylindrical body fitted on the outer side of the rotor with a small gap therebetween and having a large number of concave and convex portions parallel to the generating line formed continuously in the circumferential direction on the inner peripheral surface; A mechanical pulverizing device for finely pulverizing in a chamber, comprising a supply means for supplying a material to be pulverized from a circumferential direction to a vicinity of a central axis, and a concave and convex portion parallel to the fine gap on a side surface of the rotor in a circumferential direction. A mechanical pulverizing device characterized by being continuously formed ";(2)" a fine gap parallel to a surface of the cylindrical body opposed to the side surface of the rotor is formed by continuously forming the concave and convex portions in the circumferential direction. The mechanical pulverizing device according to the above (1), wherein
(3) "A plurality of flat plates are formed radially continuously from the center in the circumferential direction while maintaining a minute gap parallel to the surface of the cylindrical body facing the side surface of the rotor. (4) "The mechanical crushing apparatus according to the above (1)", wherein the pin is continuously arranged in the circumferential direction while maintaining a minute gap parallel to a surface of the cylindrical body facing the side surface of the rotor. The mechanical pulverizing device according to the above (1) is characterized in that it is formed.

[0010] The object of the present invention is to provide (5) a rotor having a large number of concavo-convex portions formed on an outer peripheral surface thereof, which are supported by a rotating shaft and are parallel to a generatrix, continuously formed in the circumferential direction; A cylindrical body which is provided with a gap and has a large number of uneven portions parallel to the generating line formed on the inner peripheral surface thereof continuously formed in the circumferential direction, wherein the pulverized material is finely pulverized in a pulverizing chamber comprising the fine gap. A crushing device, comprising a supply means for supplying the material to be crushed to the vicinity of a central axis from a circumferential direction, and a concave / convex portion parallel to the minute gap on a side surface of the rotor is continuously radially formed from a central portion in a circumferential direction. Mechanical crushing device, characterized by forming a plurality of flat plates on the
(6) The above-mentioned (5), wherein the uneven portion is formed continuously in the circumferential direction while maintaining a minute gap parallel to a surface of the cylindrical body facing the side surface of the rotor. Mechanical crushing apparatus ", (7)" a plurality of flat plates radially continuous from the center in the circumferential direction while maintaining a minute gap parallel to a surface of the cylindrical body opposed to the side surface of the rotor. Wherein the mechanical pulverizing device according to the above (5),
(8) The above-mentioned item (5), wherein the pin is formed continuously in the circumferential direction while maintaining a minute gap parallel to a surface of the cylindrical body facing the side surface of the rotor. "Mechanical crusher".

[0011] Further, the present invention provides (9) a rotor having a plurality of uneven portions formed on an outer peripheral surface thereof, which are supported by a rotating shaft and are parallel to a generating line, continuously formed in a circumferential direction; A cylindrical body provided with a small gap and having a large number of concave and convex portions parallel to the generating line formed on the inner peripheral surface thereof continuously formed in the circumferential direction; A grinding device, comprising a supply means for supplying an object to be ground to the vicinity of a central axis from a circumferential direction, wherein a pin parallel to the minute gap is continuously formed in a circumferential direction on a side surface of the rotor. Characteristic mechanical crusher ", (10)" A plurality of irregularities are radially continuous from the center in the circumferential direction while maintaining a minute gap parallel to the surface of the cylindrical body facing the side surface of the rotor. (9) The mechanical pulverizer according to the above (9), wherein 1) "A plurality of flat plates are formed radially continuously from the center in the circumferential direction while maintaining a minute gap parallel to the surface of the cylindrical body facing the side surface of the rotor. (9) The mechanical crushing apparatus according to the above mode (9), (12) "a pin is continuously formed in the circumferential direction while maintaining a minute gap parallel to a surface of the cylindrical body facing the side surface of the rotor." The mechanical pulverizer according to the above mode (9) ".

Another object of the present invention is to provide (13) a rotor in which a number of concave and convex portions which are supported by a rotating shaft and which are parallel to a generating line are formed continuously in a circumferential direction on an outer peripheral surface; A cylindrical body provided with a small gap and having a large number of concave and convex portions parallel to the generating line formed on the inner peripheral surface thereof continuously formed in the circumferential direction; A crushing device, wherein a concave portion is provided on the side surface of the rotor in the circumferential direction and continuously provided in the longitudinal direction, while the cylindrical inner peripheral surface is minutely arranged between the concave portion on the rotor side surface. A mechanical pulverizer characterized by being provided with a convex portion fitted with a gap continuously in the circumferential direction. "

[0013] The object of the present invention is to provide (14) the present invention, wherein "a concave portion is provided on the side surface of the rotor in the circumferential direction and is continuously provided in the longitudinal direction, while the peripheral surface of the cylindrical body is the rotary member. (1) characterized in that a convex portion fitted with a small gap between the concave portion and the concave portion on the side surface of the child is continuously provided in the circumferential direction.
(15) The mechanical pulverizer according to any one of the above items (4) to (4), (15) “a concave portion is provided on the side surface of the rotor in the circumferential direction and is continuously provided in the longitudinal direction. The (5) to (5), wherein the inner peripheral surface of the cylinder is provided with a convex portion which is fitted in the concave portion of the rotor side surface with a small gap therebetween in the circumferential direction. 8) The mechanical pulverizing device according to any one of the items 8).

[0014] Further, according to the present invention, there is provided (16) the present invention as set forth in any one of the above (1) to (15), characterized by comprising compressed air for supplying an object to be ground. (17) “Mechanical crusher according to the above (16), characterized in that the pressure or flow rate of the compressed air used for supplying the material to be crushed is controlled”, (1)
8) “Mechanical pulverizer according to any one of the above (5) to (8), including an accelerating tube for supplying an object to be pulverized”, (19) “ The mechanical pulverizing device according to any one of the above (16) to (18), further comprising a temperature control unit and a humidity control unit for supply air.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of the mechanical pulverizer according to the first aspect. This device is equipped with the lower side of the rotor (22A)
And the upper and lower side surfaces (22B) are formed with concavo-convex portions continuously in the circumferential direction. In the present invention, the “concavo-convex portion formed continuously in the circumferential direction” may be a concentric concavo-convex portion like the upper side surface (22B) in FIG. 1 or the lower side surface (22A) in FIG. ) May be spiral concavo-convex portions. Further, in this pulverizing device, not only are the concave and convex portions formed on the lower side surface (22A) and the upper side surface (22B) of the rotor, but also the lower side surface (26A) of the cylindrical body facing the lower side surface (22A) of the rotor. ) And the upper side of the rotor (22
An uneven portion is also formed on the lower side surface (26A) of the cylindrical body facing B). The uneven portion on the inner surface of the cylinder may be formed continuously in the circumferential direction, may be formed from a plurality of flat plates in a radial pattern, or may be formed by continuously forming pins in the circumferential direction. It may be formed by doing so. A minute gap is provided in the range of 0.3 to 2.0 mm between the product exhaust side surface (26B) at the upper part of the cylinder and the outside of the upper side surface (22B) of the rotor. For this reason, in this apparatus, the crushing surface (2
2) In addition to (26), side surfaces (22A), (22B),
Since a grinding vortex is also generated on the (26A) and (26B) planes, the grinding function is improved. However, in the present invention,
The rotor can be provided with an uneven portion only on the lower side surface (22A), while the cylindrical body can be provided with an uneven portion only on the upper opposed surface (26B). Further, similarly, the rotor can be provided with an uneven portion only on the upper side surface (22B), while the cylindrical body can be provided with an uneven portion only on the lower opposing surface (26A).

FIG. 2 shows an example of the mechanical pulverizer according to the second aspect. This device is equipped with the lower side of the rotor (22A)
A plurality of flat plates (flat portions (26C), (26D)) on the upper side surface (22B) of which uneven portions parallel to the minute gap between the inner surface of the cylinder extend radially continuously from the center portion in the circumferential direction. )
Is formed. In this pulverizing device, not only the lower side surface (22A) and the upper side surface (22B) of the rotor are formed with irregularities extending radially, but also the cylindrical lower surface (22A) of the rotor. Lower inner surface (26A)
The lower inner surface (26A) opposing the upper side surface (22B) is also formed with an uneven portion, and the uneven portion is formed by continuously forming pins in the circumferential direction. For this reason, in this apparatus, the crushed material supplied from the crushed material supply port (28) always collides with the flat plate in the crushing path, so that the crushing function is improved. However, the uneven portion on the inner surface of the cylinder is not limited to a plurality of radial flat plates, but may be a weir-like body formed continuously in the circumferential direction, or may be formed from pins arranged radially. Is also good. Furthermore, in this crushing device, the rotor has a lower side surface (22A).
Is provided with an uneven portion only, while the cylindrical body has an upper facing surface (2
6B) can be provided with an uneven portion only.
The rotor can be provided with an uneven portion only on the upper side surface (22B), while the cylindrical body can be provided with an uneven portion only on the lower opposing surface (26A).

FIG. 3 shows an example of the mechanical pulverizer according to the third aspect. Pin portions are formed on the lower side surface (22A) of the rotor and the lower side surface (26A) of the cylindrical body so as to be continuously located in the circumferential direction with a small gap therebetween. Similarly, a pin array is formed with a minute gap by using a number of parallel pins on the product discharge side surface (26B) of the cylindrical body. For this reason, in this apparatus, the lower side surface (22C) and the upper side surface (22) of the rotor are added to the vortex flow of the crushing peripheral surfaces (22) and (26) in the crushing chamber.
D), lower side (26C), upper side (26D) of the cylinder
In this case, since the shear pulverization occurs, the pulverization function is improved. However, in the present invention, the rotor has a lower side surface (22).
A pin row can be provided only on C), while a pin row can be provided only on the upper facing surface (26D) of the cylindrical body. Similarly, the rotor can be provided with a pin array only on the upper side surface (22D), while the cylindrical body can be provided with a pin array only on the lower opposing surface (26C). Also, the upper and lower opposing surfaces (26
C) and (26D) may be provided with an uneven portion instead of the pin row.

FIG. 4 shows a mechanical pulverizer according to a fourth aspect of the present invention. This crusher is provided with a recess (2) on the crushing peripheral surface of the rotor.
2E) in the circumferential direction and continuously in the longitudinal direction, while the crushing peripheral surface of the cylindrical body is fitted with a small gap between the crushing peripheral surface of the rotor and the recess (22E). The mounted convex portion (26E) is provided continuously in the circumferential direction. Recess (22
E) and the projections (26E) are provided with a minute gap between the outside (circumferential surface) of the rotor and the cylindrical body to form the projections and depressions (22E) (26E).
E) is located in the fitted state. The outer peripheral surface of the concave portion (22E) of the rotor and the convex portion (26
E) are formed in a large number in the direction intersecting the generatrix and continuously in the longitudinal direction. For this reason, in this apparatus, in addition to the horizontal eddy current in the crushing chamber, more and more intense vertical eddies are generated than in the apparatus of claim 1, so that the residence time of the material to be crushed in the crushing chamber is extended. The grinding function is significantly improved.

The mechanical pulverizing device according to the fifth aspect is shown in FIG.
Is combined with the device shown in FIG. The circumferential surface and side surface of the rotor, the outer surface (circumferential surface) and the side surface of the rotor, the rotor having a small gap on the side surface of the grinding chamber cylinder with the concave / convex portion fitted therein, in the direction of reducing the circumferential shape of the rotor. The outer peripheral surface for fitting the concave portion (22E) with the convex portion (26E)
In addition, a large number of uneven portions in the direction intersecting the generatrix are formed continuously in the longitudinal direction. For this reason, in this apparatus, in addition to the horizontal vortex in the grinding chamber, more and more intense vertical vortex is generated than in the apparatus of claim 1, so that the residence time of the material to be ground in the grinding chamber is extended. The grinding function is significantly improved.

The mechanical crushing device according to the sixth aspect is shown in FIG.
Is combined with the device shown in FIG. The rotor is provided with concave portions (22) on the side surface of the crushing chamber having a flat plate portion on the side surface of the rotor in the direction of decreasing the circumferential shape.
The outer peripheral surface to which E) is fitted has a plurality of projections and depressions in the direction intersecting the generatrix, each of which is continuously formed in the longitudinal direction on the projection (26E). For this reason, in this apparatus, in addition to the horizontal eddy current in the grinding chamber, more and more intense vertical eddies are generated than in the apparatus of claim 2, so that
The residence time of the material to be crushed in the crushing chamber is extended, and the crushing function is significantly improved.

According to a seventh aspect of the present invention, there is provided a mechanical pulverizer in which compressed air is used in a supply port (28) of the pulverized object of the first to sixth mechanical pulverizers. The blower load on the exhaust side of the crushed material is reduced to obtain the same crushing ability.

According to a eighth aspect of the present invention, there is provided a mechanical pulverizing apparatus, wherein compressed air is used for a pulverized material supply port (28) of the mechanical pulverizing apparatus according to any one of the first to sixth aspects, and the air pressure is set to 49 to 49.
980 kPa, or in which controlled the air flow rate as the residence time of the pulverized product or object to be pulverized pulverizing chamber in the range of 1 ^-5 to 1 ^-2 sec a. Overpulverization of a substance that is easily pulverized in accordance with the characteristics of the object to be pulverized can be suppressed, and, on the other hand, the efficiency of pulverization of a hardly pulverized object can be improved, and pulverization can be performed by increasing the supply amount of the object to be pulverized.

FIG. 5 shows a mechanical pulverizer according to the ninth aspect. 3. A powder speed passing through the mechanical pulverizer according to claim 2, wherein compressed air is used at a supply port of the pulverized material, and a Laval pipe (28A) is provided for accelerating the supply of the pulverized substance. Is controlled to be in the range of 50 to 400 m / sec. The crushed object is accelerated and violently collides with the lower side surface (22A) of the rotor, so that the crushing efficiency is improved and crushing can be performed by increasing the supply amount of the crushed object.

According to a tenth aspect of the present invention, there is provided a mechanical pulverizer according to the seventh to ninth aspects, wherein the temperature range of the compressed air for supplying the material to be pulverized in the mechanical pulverizer is 0 to 40 degrees and the humidity is 5 to 5. The temperature and humidity are controlled in a range of 50%. Depending on the powder characteristics of the material to be crushed, it is possible to prevent the fusion of a low melting point product in the crushing chamber or prevent the toner aggregation due to liquid crosslinking at the time of crushing, thereby improving the crushing efficiency and increasing the supply amount of the crushed material. It becomes possible to do.

[0025]

EXAMPLE 1 (Claim 1) A mixture of 75% by weight of a polyester resin, 10% by weight of a styrene acrylic copolymer resin and 15% by weight of carbon black is melt-kneaded by a roll mill, cooled and solidified, and then hammer milled. And coarsely pulverized. Next, this coarsely pulverized product was set in a mechanical pulverizer shown in FIG.
sec and pulverized, the weight average particle diameter was 7.
At 0 μm, ultrafine particles of 4 μm or less are 32% in number content.
I got Note that a Coulter Counter Multisizer was used for the particle size measurement.

COMPARATIVE EXAMPLE 1 Using the current classification device shown in FIG. 6 and grinding under the same conditions as in Example 1, the weight average particle size was 7.45.
The number content of 30% was obtained with ultrafine particles of 4 μm or less.

Example 2 (Claim 2) A mixture of 75% by weight of a polyester resin, 10% by weight of a styrene acrylic copolymer resin and 15% by weight of carbon black is melt-kneaded by a roll mill, cooled and solidified, and then cooled by a hammer mill. And coarsely pulverized. Next, this coarsely pulverized product was cut with a mechanical pulverizer shown in FIG.
When the height of the flat plate was set to 15 mm at intervals of degrees and the peripheral speed of the rotor was set to 140 m / sec, pulverization was performed. The fine particles having a weight average particle diameter of 7.1 μm and 4 μm or less were 32% in number content. I got

Example 3 (Claim 3) A mixture of 75% by weight of a polyester resin, 10% by weight of a styrene-acrylic copolymer resin and 15% by weight of carbon black is melt-kneaded by a roll mill, cooled and solidified, and then cooled by a hammer mill. And coarsely pulverized. Next, the coarsely pulverized product was set to have a circumferential gap of 1.0 mm and a fine side gap of 40 mm using the mechanical pulverizer shown in FIG. 1/3 in the radial direction and 1 in the circumferential direction
Set the length of the pin and the height of the flat plate to 15 mm at intervals of 0 degrees and 10 mm in the radial direction, and set the pins on the side and the fitted outer surface so that they do not interfere with each other. When pulverization was performed at 140 m / sec, the weight average particle diameter was 7.1 μm, and ultrafine particles of 4 μm or less were obtained in a number content of 31%.

Example 4 (Claim 4) A mixture of 75% by weight of a polyester resin, 10% by weight of a styrene-acrylic copolymer resin and 15% by weight of carbon black is melt-kneaded by a roll mill, cooled and solidified, and then cooled by a hammer mill. And coarsely pulverized. Next, this coarsely pulverized product was formed with a mechanical pulverizer shown in FIG. 1 to have a circumferential gap of 1.0 mm, and the outer circumferential surface (cover surface) fitted with the rotor in the circumferential direction and 4 mm in the longitudinal direction. At a minute interval, a concave surface having a depth of 20 mm and a width of 20 mm in the radial direction and a depth of 15 mm and a width of 15 m are formed on the outer peripheral surface.
The convex surface is provided at intervals of m, and the irregularities of the side surface and the fitted outer peripheral surface are set at positions where they do not interfere with each other.
/ Sec and pulverized, the particles having a weight average particle diameter of 6.7 μm and ultrafine particles of 4 μm or less having a number content of 3
1% was obtained.

Example 5 (Claim 5) A mixture of 75% by weight of a polyester resin, 10% by weight of a styrene acrylic copolymer resin and 15% by weight of carbon black is melt-kneaded by a roll mill, cooled and solidified, and then cooled by a hammer mill. And coarsely pulverized. Next, the coarsely pulverized product was set in the mechanical pulverizer shown in FIG. 1 to have a circumferential gap of 1.0 mm and a small side gap of 1.5 mm, and a circumferential direction of the rotor and a fitted outer peripheral surface (cover). Surface), a concave surface having a depth of 20 mm and a width of 20 mm in the radial direction, and a convex surface having a depth of 15 mm and a width of 15 mm were provided on the outer peripheral surface at intervals of 4 equal to the longitudinal direction, and the side surface and the fitted surface were fitted. The unevenness of the outer peripheral surface was set at a position where it did not interfere, and the rotor was set at a peripheral speed of 140 m / sec and pulverized.
Ultrafine particles having a size of 32 μm or less were obtained in a number content of 32%.

Example 6 (Claim 6) A mixture of 75% by weight of a polyester resin, 10% by weight of a styrene-acrylic copolymer resin and 15% by weight of carbon black is melt-kneaded by a roll mill, cooled and solidified, and then solidified by a hammer mill. And coarsely pulverized. Next, this coarsely pulverized product was cut with a mechanical pulverizer shown in FIG.
The height of the flat plate is set to 15 mm at intervals of degrees, and the rotor circumferential direction and the fitted outer peripheral surface (cover surface) are radially 20 mm deep and 4 mm equally spaced apart from each other in the longitudinal direction. 20
mm concave surface, a convex surface is provided on the outer peripheral surface at a depth of 15 mm and a width of 15 mm, and the unevenness of the side surface and the fitted outer peripheral surface is set at a position that does not interfere, and the peripheral speed of the rotor is 140 m / s.
When ec was set and pulverized, the weight average particle diameter was 6.6.
As a result, 32% was obtained in terms of the number content of ultrafine particles having a particle size of 4 μm or less.

Example 7 (Claim 7) A mixture of 75% by weight of a polyester resin, 10% by weight of a styrene-acrylic copolymer resin and 15% by weight of carbon black is melt-kneaded by a roll mill, cooled and solidified, and then solidified by a hammer mill. And coarsely pulverized. Next, this coarsely pulverized product was cut with a mechanical pulverizer shown in FIG.
The height of the flat plate is set to 15 mm at intervals of degrees, and the rotor circumferential direction and the fitted outer peripheral surface (cover surface) are radially 20 mm deep and 4 mm equally spaced apart from each other in the longitudinal direction. 20
mm concave surface, a convex surface is provided on the outer peripheral surface at a depth of 15 mm and a width of 15 mm, and the unevenness of the side surface and the fitted outer peripheral surface is set at a position that does not interfere, and the peripheral speed of the rotor is 140 m / s.
At ec, compressed air was injected from the supply port and pulverized. As a result, a weight average particle diameter was 6.3 μm, and ultrafine particles of 4 μm or less were obtained in a number content of 32%.

Example 8 (Claim 8) A mixture of 75% by weight of a polyester resin, 10% by weight of a styrene-acrylic copolymer resin and 15% by weight of carbon black is melt-kneaded by a roll mill, cooled and solidified, and then cooled by a hammer mill. And coarsely pulverized. Next, this coarsely pulverized product was cut with a mechanical pulverizer shown in FIG.
The height of the flat plate is set to 15 mm at intervals of degrees, and the rotor circumferential direction and the fitted outer peripheral surface (cover surface) are radially 20 mm deep and 4 mm equally spaced apart from each other in the longitudinal direction. 20
mm concave surface, a convex surface is provided on the outer peripheral surface at a depth of 15 mm and a width of 15 mm, and the unevenness of the side surface and the fitted outer peripheral surface is set at a position that does not interfere, and the peripheral speed of the rotor is 140 m / s.
ec, and 490 kpa of compressed air was supplied from the supply port at the same time as the material to be pulverized, and pulverized at a pulverizing pressure. The pulverized material in the pulverizing chamber was 8 ^-4 sec, the weight average particle diameter was 6.2 μm, Ultrafine particles of 4 μm or less have a number content of 3
3% was obtained.

Example 9 (Claim 9) A mixture of 75% by weight of a polyester resin, 10% by weight of a styrene-acrylic copolymer resin and 15% by weight of carbon black is melt-kneaded by a roll mill, cooled and solidified, and then solidified by a hammer mill. And coarsely pulverized. Next, this coarsely pulverized product was cut with a mechanical pulverizer shown in FIG.
The height of the flat plate is set to 15 mm at intervals of degrees, and the rotor circumferential direction and the fitted outer peripheral surface (cover surface) are radially 20 mm deep and 4 mm equally spaced apart from each other in the longitudinal direction. 20
mm concave surface, a convex surface is provided on the outer peripheral surface at a depth of 15 mm and a width of 15 mm, and the unevenness of the side surface and the fitted outer peripheral surface is set at a position that does not interfere, and the peripheral speed of the rotor is 140 m / s.
ec, and 490 kpa of compressed air from a Laval tube was injected from the supply port simultaneously with the material to be pulverized, and pulverized at a pulverizing pressure. The ultrafine particles having a weight average particle diameter of 6.0 μm and a particle size of 4 μm or less were 33% in number. %.

Example 10 (Claim 10) A low-melting mixture having a glass transition point (Tg = 50 ° C.) of 80% by weight of a polyester resin, 5% by weight of a styrene-acrylic copolymer resin and 15% by weight of carbon black is roll-milled. After melt-kneading and solidifying by cooling, the mixture was roughly pulverized by a hammer mill. Next, the coarsely pulverized product was flattened with a mechanical pulverizer shown in FIG. Is set to 15 mm, and on the rotor circumferential direction and the fitted outer peripheral surface (cover surface), a concave surface having a depth of 20 mm and a width of 20 mm in the radial direction is provided at regular intervals of 4 with respect to the longitudinal direction.
A convex surface is provided on the outer peripheral surface at a depth of 15 mm and a width of 15 mm, and irregularities of the side surface and the fitted outer peripheral surface are set at positions where they do not interfere with each other, the peripheral speed of the rotor is set at 140 m / sec, 490 kp compressed air at the same time as the material to be ground
a, the air temperature at that time was controlled at 5 ° C. and the humidity was 20%, and the mixture was pulverized to a weight average particle diameter of 6.0 μm.
The number of ultrafine particles having a particle size of 4 μm or less is 35% by 20.
Even when 0 kg was obtained, there was no fused material in the grinding chamber.

Comparative Example 2 When pulverization was performed under the same conditions as in Example 10 without controlling the temperature and humidity of the compressed air, the pulverization was impossible when 30 kg of the material to be pulverized was processed. A large amount of fused material was confirmed.

[0037]

As is apparent from the above detailed and concrete description, according to the mechanical pulverizing apparatus according to the first, second and third aspects of the present invention, the rotor of the conventional apparatus is provided with irregularities in a predetermined manner. Since the portion is additionally formed on the side surface of the rotor, the probability of collision of the crushed object is increased, and a crushed material having a finer diameter can be easily obtained. According to the mechanical pulverizer of the fourth aspect, since irregularities are additionally formed on the outer peripheral surface of the rotor and the inner peripheral surface of the cylindrical body, the number of vortices generated in the pulverization chamber increases, and the pulverization efficiency is improved. Thus, it is possible to easily obtain a pulverized product having a finer diameter. According to the mechanical grinding device of the fifth aspect, the number of eddy currents is increased and the eddy current is amplified by the synergistic effect of the first and fourth aspects, so that the grinding efficiency is significantly improved, It becomes possible to update the critical pulverized particle size. According to the mechanical pulverizer according to the sixth aspect, the number of vortex flows is increased and the vortex flow is amplified by the synergistic effect of the second aspect and the fourth aspect. It becomes possible to update the critical pulverized particle size. Claim 7
According to the mechanical pulverizer described in the above, the addition of compressed air to the effects of claims 1 to 6 causes an increase in the number of eddy currents generated, eddy currents, and amplification of the residence time, so that the crushing efficiency is significantly improved, It becomes possible to update the critical pulverized particle size. According to the mechanical pulverizer of the eighth aspect, the control function is added to the effect of the seventh aspect to increase the number of eddies generated,
Since the residence time is amplified, the pulverization efficiency is significantly improved, and the critical pulverization particle size can be updated. Claim 9
According to the mechanical pulverizer described in the above, the acceleration at the time of supplying the material to be pulverized to the pulverization chamber is added to the effect of claim 8, so that the collision energy when the pulverized substance reaches the pulverization chamber is added, and the number of eddy currents generated In addition, the synergistic effects of the increase in the diameter and the vortex and the residence time are added, and the pulverization efficiency is remarkably improved, and the critical particle size can be updated. According to the mechanical pulverizer of the tenth aspect, in addition to the effects of the seventh to ninth aspects, even in the case of a toner having a low melting point or a strong cohesiveness, the fine particle size can be reduced without lowering the pulverization ability. Powder can be easily obtained.

[Brief description of the drawings]

FIG. 1 shows a mechanical grinding device according to claim 1 of the present invention.

FIG. 2 shows a mechanical pulverizer according to a second aspect of the present invention.

FIG. 3 shows a mechanical pulverizer according to a third aspect of the present invention.

FIG. 4 shows a mechanical pulverizer according to a fourth aspect of the present invention.

FIG. 5 shows a mechanical pulverizer according to the ninth aspect of the present invention.

FIG. 6 shows an example of a conventional mechanical pulverizer.

FIG. 7 shows an example of an uneven groove on a crushing peripheral surface of a mechanical pulverizer.

FIG. 8 shows an example of an uneven groove on a crushing peripheral surface of a mechanical pulverizer.

FIG. 9 shows an example of an uneven groove on a crushing peripheral surface of a mechanical pulverizer.

FIG. 10 shows an example of an uneven groove on a crushing peripheral surface of a mechanical pulverizer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Concavo-convex part 22A Lower side surface of rotor 22B Upper side surface of rotor 22C Lower side surface of rotor 22D Upper side surface of rotor 22E Recessed surface of crushing surface of rotor 23 Rotation shaft 24 Gap 25 Crushing unevenness portion 26A 26B Upper side surface of cylindrical body 26C Lower side surface of cylindrical body 26D Upper side surface of cylindrical body 26E Convex part of crushing peripheral surface of cylindrical body 27 Product outlet 28 Supply port 28A Crushed material supply means 29 Stirrer blade 30 Casing 31 Stirring blade 32 Classification ring

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yoichi Maekawa Ricoh Co., Ltd. 1-3-6 Nakamagome, Ota-ku, Tokyo

Claims (10)

[Claims] 1. A rotor which is supported by a rotating shaft and has a large number of concave and convex portions formed on an outer peripheral surface thereof in parallel with a generating line in a circumferential direction, and is fitted on the outer side of the rotor with a small gap therebetween to form an inner peripheral portion. A cylindrical body having a large number of concave and convex portions formed in the surface thereof in parallel with the generating line in a circumferential direction, wherein the mechanical grinding device finely grinds the material to be ground in a grinding chamber comprising the minute gaps. A mechanical pulverizer, comprising: supply means for supplying an object from a circumferential direction to a position near a central axis, wherein a concavo-convex portion parallel to the minute gap is continuously formed on a side surface of the rotor in a circumferential direction. 2. A rotor which is supported by a rotating shaft and has a plurality of uneven portions formed on an outer peripheral surface thereof in parallel with a generating line in a circumferential direction, and an inner peripheral surface provided with a small gap outside the rotor. A cylindrical body in which a large number of uneven portions parallel to the generating line are continuously formed in the circumferential direction, and a pulverization object is finely pulverized in a pulverization chamber formed of the minute gaps. Supply means for supplying from the circumferential direction to the vicinity of the central axis, and a plurality of flat plates are formed radially on the side surface of the rotor from the central portion to the uneven portion parallel to the minute gap in the circumferential direction. Characteristic mechanical crusher. 3. A rotor which is supported by a rotating shaft and has a large number of concave and convex portions formed in the outer peripheral surface thereof in parallel with the generating line continuously in a circumferential direction, and an inner peripheral surface provided with a small gap outside the rotor. A cylindrical body in which a large number of uneven portions parallel to the generating line are continuously formed in the circumferential direction, and a pulverization object is finely pulverized in a pulverization chamber formed of the minute gaps. A mechanically crushing device, comprising: a supply means for supplying from the circumferential direction to the vicinity of the central axis, wherein a pin parallel to the minute gap is continuously formed in the side surface of the rotor in the circumferential direction. 4. A rotor which is supported by a rotating shaft and has a plurality of concave and convex portions formed on an outer peripheral surface thereof in parallel with a generating line in a circumferential direction, and an inner peripheral surface provided with a small gap outside the rotor. A cylindrical body formed with a large number of concave and convex portions parallel to the generating line in the circumferential direction, and a mechanical grinding apparatus for finely grinding an object to be ground in a grinding chamber comprising the minute gap, wherein the rotor On the side surface, a concave portion is provided in the circumferential direction and continuously provided in the longitudinal direction, while the cylindrical inner peripheral surface has a convex portion fitted with a small gap between the concave portion on the rotor side surface. A mechanical pulverizer, which is provided continuously in a circumferential direction. 5. A concave portion is provided on the side surface of the rotor in the circumferential direction and continuously provided in the longitudinal direction, while the peripheral surface of the cylinder is provided with a minute gap between the concave portion on the rotor side surface. The mechanical crushing device according to claim 1, wherein a convex portion fitted with a gap is continuously provided in a circumferential direction. 6. A concave portion is provided on the side surface of the rotor in the circumferential direction and continuously provided in the longitudinal direction, while the peripheral surface of the cylindrical body is provided with a minute gap between the concave portion on the rotor side surface. The mechanical crusher according to claim 2, further comprising: a convex portion fitted with a gap in the circumferential direction. 7. The apparatus according to claim 1, further comprising compressed air for supplying the material to be ground.
A mechanical grinding device according to item 1. 8. The method according to claim 7, wherein a pressure or a flow rate of the compressed air used for supplying the material to be ground is controlled.
A mechanical grinding device according to item 1. 9. The mechanical grinding device according to claim 2, further comprising an acceleration tube for supplying the material to be ground. 10. The mechanical pulverizer according to claim 7, further comprising a temperature controller and a humidity controller for the supply air.